This really doesn’t have much to do with Nestlé. This is about the purchasing habits of consumers in different markets as influenced by global wealth inequality, lacking education, and inadequate access to healthcare. While large corporations absolutely have certain influence on those factors, this issue of more sugar in some products is so far downstream from the real problems that it’s just a useless distraction.
While ideally you’d want a column for serving size, package size, and per 100g, if you’re only gonna have one it should definitely be the per 100g since that’s the only one that allows you to easily compare between different brands and products.